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Photolysis of polyphosphate ions in alkaline aqueous solution
Author(s) -
Rosso Janina A.,
Gonzalez Mónica C.,
Mártire Daniel O.
Publication year - 2000
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/(sici)1097-4601(2000)32:2<111::aid-kin7>3.0.co;2-2
Subject(s) - chemistry , polyphosphate , radical , photodissociation , pyrophosphate , aqueous solution , ion , decomposition , photochemistry , radiolysis , inorganic chemistry , phosphate , organic chemistry , enzyme
Photolysis of pyrophosphate and tripolyphosphate ions in aqueous solution is proposed to produce electron detachment with formation of pyrophosphate and tripolyphosphate radicals (with quantum yields <0.1 at 266 nm), respectively. Formation of P 2 O 7 ·3− is observed after photolysis of both polyphosphate ions, because the decomposition of P 3 O 10 ·4− yields P 2 O 7 ·3− . The latter radicals further react with hydroxyl ions ( k = 1.4 × 10 6 M −1 s −1 ) generating HO · radicals. The reaction of the solvated electrons with molecular oxygen produces O 2 ·− . The rate constants for the reaction of SO 4 ·− radicals with P 2 O 7 4− and P 3 O 10 5− were also measured. © 2000 John Wiley & Sons, Inc. Int J Chem Kinet 32: 111–117, 2000